Scaling behavior of individual barkhausen avalanches in nucleation-mediated magnetization reversal processes [electronic resource].

Published:: Berkeley, Calif. : Lawrence Berkeley National Laboratory, 2009.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 11 : digital, PDF file
Additional Creators:: Lawrence Berkeley National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

We report the scaling behavior of Barkhausen avalanches along the hysteresis loop of a CoCrPt alloy film with perpendicular magnetic anisotropy for every field step of 200 Oe. Individual Barkhausen avalanches are directly observed via high-resolution soft X-ray microscopy with a spatial resolution of 15 nm. The Barkhausen avalanches exhibit a power-law scaling behavior, where the scaling exponent of the power-law distribution drastically changes from 1 ± 0.04 to 1.47 ± 0.03 as the applied magnetic field approaches the coercivity of the CoCrPt film. We infer that this is due to the coupling of adjacent domains.

Report Numbers:

E 1.99:lbnl-2846e
lbnl-2846e

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Published through SciTech Connect.
11/09/2009.
"lbnl-2846e"
Applied Physics Letters ISSN 0003-6951; APPLAB FT
Fischer, Peter; Shin, Sung-Chul; Kim, Dong-Hyun; Im, Mi-Young.
Materials Sciences Division

Funding Information:

DE-AC02-05CH11231

View MARC record | catkey: 14444798